It has something feminine in, one thinks (5)
I believe the answer is:
brain
'it has something feminine in one thinks' is the definition.
The definition suggests a singular noun which matches the answer.
'it has something feminine in' is the wordplay.
I cannot really see how this works, but
'in' is found in the answer.
The remaining letters 'bra' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for brain that I've seen before include "It controls the central nervous system" , "and 15 ac. The loss of experts through emigration" , "to get hit over the head" , "Encephalon" , "It's in the skull" .)