You wouldn’t want one to have a crush on you (3)
I believe the answer is:
boa
'you wouldn't' is the definition.
The definition suggests a singular noun which matches the answer.
'want one to have a crush on you' is the wordplay.
I cannot quite see how this works, but
'one' could be 'a' and 'a' is located in the answer.
The remaining letters 'bo' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for boa that I've seen before include "Large constrictor snake" , "Large constricting snake" , "Wrap" , "Long, thin, feathery scarf" , "Large reptile" .)