Impulsive Yank soon antes up (11)

I believe the answer is:

spontaneous

'impulsive' is the definition.
('spontaneous' can be similar in meaning to 'impulsive')

'yank soon antes up' is the wordplay.
'yank' is an anagram indicator ('yank' can mean to pull around and move).
'soon'+'antes'+'up'='soonantesup'
'soonantesup' is an anagram of 'SPONTANEOUS'.

(Other definitions for spontaneous that I've seen before include "Unprompted" , "Cause of Mr Krook's death" , "Impromptu" , "Impulsive, unpremeditated" .)

I've seen this clue in The Times.

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