Crossword Genius

Introduction to sport: it enables us to develop fitness (12)

Ross

I believe the answer is:

suitableness

'fitness' is the definition.
(thesaurus)

'introduction to sport it enables us to develop' is the wordplay.
'introduction to' suggests taking the first letters (I've seen 'introductions to' mean this).
'to develop' indicates an anagram.
The initial letter of 'sport' is 's'.
'it'+'enables'+'us'='itenablesus'
'itenablesus' is an anagram of 'uitableness'.
's'+'uitableness'='SUITABLENESS'

I've seen this clue in The Telegraph.
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