I would generally say no, it is not appropriate, for the reason Pope Benedict XVI gave:
“Wherever applause breaks out in the liturgy because of some human achievement, it is a sure sign that the essence of liturgy has totally disappeared and been replaced by a kind of religious entertainment. ” (Spirit of the Liturgy p. 198)
Essentially, what this means is that if your clapping for the singers during mass, or clapping because the priest gave a good homily, you’re operating a superficial level of focusing on the human element of the mass instead of what God is doing. The mass is not a performance, it is not a concert, it is not a play. Applause during the mass makes it appear like it is such.
Furthermore, applause is distracting from prayer. It is making a lot of noise that may be disturbing to those praying.
It is possible that parishes may have a distinct culture in which clapping is not a celebration of a human achievement, but as a way of “amen-ing,” or showing agreement with a particular point made during the homily, which perhaps is more licit, but still unnecessary and distracting and therefore should be discouraged gently and pastorally.
We should remember that what we are seeing during the mass is what the Blessed Virgin Mother, John, and Mary Magdalene saw on Calvary, and therefore, we should model our behavior after theirs. Were we there on Calvary we would clearly see it would be very inappropriate to be clapping while Jesus is dying on the cross, and therefore, we should consider it similarly inappropriate to applaud during the mass.
Does this help you? God bless!