He classifies a kiss on love film after first take (10)
I believe the answer is:
taxonomist
'he classifies a kiss' is the definition.
The definition suggests a singular noun which matches the answer.
'love film after first take' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'film' becomes 'mist' (to film over is to mist or fog over).
'after' is a charade indicator (letters next to each other).
'first take' becomes 'taxon' (I can't explain this - if you can you should give a lot more credence to this answer).
'o'+'mist'='omist'
'omist' after 'taxon' is 'TAXONOMIST'.
'on' acts as a link.
Can you help me to learn more?
(Other definitions for taxonomist that I've seen before include "Classifier of organisms" , "one analysing the class system?" .)