Inappropriately, give hands to married ladies when dancing (7)
I believe the answer is:
misdeal
'inappropriately give hands to' is the definition.
(deal hands of cards wrongly)
'married ladies when dancing' is the wordplay.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'when dancing' indicates an anagram (letters dance around).
'ladies' with letters rearranged gives 'isdeal'.
'm'+'isdeal'='MISDEAL'
(Other definitions for misdeal that I've seen before include "Faulty distribution" , "Give out cards incorrectly" , "Right hand that isn't" , "Faulty issue of cards" , "Wrongly issue" .)