Friendliest mum itches to play (9)
I believe the answer is:
chummiest
'friendliest' is the definition.
('chummy' can be similar in meaning to 'friendly')
'mum itches to play' is the wordplay.
'to play' is an anagram indicator.
'mum'+'itches'='mumitches'
'mumitches' anagrammed gives 'CHUMMIEST'.
I've seen this clue in the Sydney Morning Herald.
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