Stimulating bar in a pub is where march goes (11)
I believe the answer is:
aphrodisiac
'stimulating' is the definition.
(thesaurus)
'bar in a pub is where march goes' is the wordplay.
I cannot really understand how this works, but
'bar' could be 'rod' (I've seen this before) and 'rod' is present in the answer.
'a' is within the answer.
'pub' could be 'ph' (public house) and 'ph' is found within the answer.
'is' is present in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for aphrodisiac that I've seen before include "the other driver" , "Substance or activity stimulating carnal desire" , "Something that stimulates desire" , "Philtre" , "Love potion" .)