Clutch component, say, coming closer (3)
I believe the answer is:
egg
'clutch component' is the definition.
(a clutch is a group of eggs)
'say coming closer' is the wordplay.
'say' becomes 'eg'.
'closer' suggests the final letters (the letter which 'closes' the word).
The last letter of 'coming' is 'g'.
'eg'+'g'='EGG'
(Other definitions for egg that I've seen before include "Bird's first home" , "Poached item?" , "Reproductive unit" , "Hen fruit" , "nit? Just a bit!" .)