Bachelor with love in his heart (and a crush on someone?) (3)
I believe the answer is:
boa
'his heart and a crush on someone?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'bachelor with love' is the wordplay.
'bachelor' becomes 'BA' (the qualification: Bachelor of Arts).
'with' means one lot of letters goes inside another.
'love' becomes 'o' (love means zero in tennis).
'ba' going around 'o' is 'BOA'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for boa that I've seen before include "Large constricting snake" , "strangler" , "Non-venomous snake" , "Feathered neckwear - snake" , "One with scaly body" .)