Crossword Genius

Saw knees trembling in passion? (8)

Ross

I believe the answer is:

weakness

'passion?' is the definition.
(thesaurus)

'saw knees trembling' is the wordplay.
'trembling' indicates anagramming the letters.
'saw'+'knees'='sawknees'
'sawknees' is an anagram of 'WEAKNESS'.

'in' acts as a link.

(Other definitions for weakness that I've seen before include "Failing or powerlessness" , "Fault or flaw" , "Frailty - flaw" , "Defect" , "Achilles heel" .)

I've seen this clue in The Sunday Times.
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