Lack of enthusiasm for The Underground perhaps (10)
I believe the answer is:
resistance
'lack of enthusiasm' is the definition.
(thesaurus)
'the underground perhaps' is the wordplay.
'the underground' becomes 'resist' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'perhaps' becomes 'ance' (I've seen this in other clues).
'resist'+'ance'='RESISTANCE'
'for' is the link.
Can you help me to learn more?
(Other definitions for resistance that I've seen before include "Withstanding" , "Organised covert opposition to an occupying power" , "Freedom fighters - it's measured in ohms" , "Violent opposition" , "Rebellious group" .)