One feels insect repelled girl (7)
I believe the answer is:
antenna
'one feels' is the definition.
(an antenna feels things)
'insect repelled girl' is the wordplay.
'insect' becomes 'ant' (ant is a kind of insect).
'repelled' shows that the letters should be reversed in order.
'girl' becomes 'Anne' (girl's name).
'anne' reversed gives 'enna'.
'ant'+'enna'='ANTENNA'
(Other definitions for antenna that I've seen before include "connected to 41?" , "could send out a message" , "receiver" , "Insect's feeler" , "What detects signals" .)