Be mature and shut up about male lover having run away with female (4,2,3)
I believe the answer is:
come of age
'be mature' is the definition.
(I've seen this in another clue)
'shut up about male lover having run away with female' is the wordplay.
I cannot really see how this works, but
'about' could be 'of' and 'of' is found in the answer.
'male' could be 'm' (common abbreviation) and 'm' is located in the answer.
'away' could be 'a' (abbreviation as used in sports fixtures) and 'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for come of age that I've seen before include "Reach adult status, perhaps 21" , "Grow up" , "Reach maturity with rights to vote etc" , "Reach full adult status" , "Reach adulthood" .)