Difficulty restraining male American in dance (5)
I believe the answer is:
rumba
'dance' is the definition.
(rumba is a kind of dance)
'difficulty restraining male american' is the wordplay.
'difficulty' becomes 'rub' (rub is a kind of difficulty**).
'restraining' means one lot of letters goes inside another.
'male' becomes 'm' (common abbreviation).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'rub' placed around 'm' is 'rumb'.
'rumb'+'a'='RUMBA'
'in' is the link.
(Other definitions for rumba that I've seen before include "What to perform" , "Caribbean dance" , "Afro-Cuban or ballroom dance" , "Cuban folk dance" , "Style of dance" .)