You wouldn't like one to have a crush on you (8)
I believe the answer is:
anaconda
'you wouldn't' is the definition.
The definition suggests a singular noun which matches the answer.
'one to have a crush on you' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
'a' is found in the answer.
'on' is within the answer.
This may be the basis of the clue (or it may be nonsense).
'like' acts as a link.
Can you help me to learn more?
(Other definitions for anaconda that I've seen before include "1 of 21 [SNAKES]" , "crawler" , "large reptile" , "South American killer" , "Boa constrictor" .)