Clues I get at changing sign (11)
I believe the answer is:
gesticulate
'sign' is the definition.
(I've seen this before)
'clues i get at changing' is the wordplay.
'changing' indicates an anagram.
'clues'+'i'+'get'+'at'='cluesigetat'
'cluesigetat' with letters rearranged gives 'GESTICULATE'.
(Other definitions for gesticulate that I've seen before include "Express by movement rather than words" , "Make vigorous hand movements" , "Sign" , "Express oneself non-verbally" , "Gesture dramatically" .)