Henry having stopped defeats gets cheers (6)
I believe the answer is:
thanks
'cheers' is the definition.
('cheers' can informally mean 'thank you')
'henry having stopped defeats' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'having stopped' indicates putting letters inside (stopping can mean blocking a gap).
'defeats' becomes 'tanks' (tank can mean to defeat decisively).
'h' inserted within 'tanks' is 'THANKS'.
'gets' is the link.
(Other definitions for thanks that I've seen before include "Brief expression of appreciation" , "I am grateful" , "I appreciate that" , "Polite acknowledgment" , "Expressions of gratitude" .)