Give performance originally in lacy pants (7)
I believe the answer is:
pliancy
'give' is the definition.
(thesaurus)
'performance originally in lacy pants' is the wordplay.
'originally' suggests taking the first letters.
'pants' indicates anagramming the letters (UK informal term for 'nonsense' or 'rubbish').
The initial letter of 'performance' is 'p'.
'in'+'lacy'='inlacy'
'inlacy' anagrammed gives 'liancy'.
'p'+'liancy'='PLIANCY'
(Other definitions for pliancy that I've seen before include "give?" , "flexibility" .)