Instinctive feelings, never quite the best for a girl (5)
I believe the answer is:
vibes
'instinctive feelings' is the definition.
'vibes' can be an answer for 'feelings' (vibe can mean a mood or feeling). I'm not certain of the 'instinctive' bit.
'never quite the best for a girl' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'vi' (short for Violet) and 'vi' is found within the answer.
The remaining letters 'bes' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for vibes that I've seen before include "Percussion instrument similar to a xylophone" , "Feelings that seem to emanate" , "Feelings (colloq.)" , "Informal mental or emotional communications" , "Feelings sensed intuitively" .)