Vacillate like a hairdryer? (4,3,3,4)
I believe the answer is:
blow hot and cold
'vacillate' is the definition.
(I've seen this in another clue)
'a hairdryer?' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'like' acts as a link.
Can you help me to learn more?
(Other definitions for blow hot and cold that I've seen before include "Be unable to decide" , "Haver" , "unpredictable) - with 5a" , "Be unsure" , "may waver" .)