Cries when TV doctor goes to operations (6)
I believe the answer is:
whoops
'cries' is the definition.
(whooping is a kind of crying)
'tv doctor goes to operations' is the wordplay.
'tv doctor' becomes 'who' (Doctor Who).
'goes to' means one lot of letters go next to another.
'operations' becomes 'ops' (abbreviation).
'who'+'ops'='WHOOPS'
'when' acts as a link.
(Other definitions for whoops that I've seen before include "Exclamation after making a mistake" , "Something said after minor accident or mistake" , "Worrying cry" , "Oh dear! That was a mistake!" , "Exclamation after a mistake; wild cries" .)