To become fit is an accessible possibility (7)
I believe the answer is:
getable
'is an accessible possibility' is the definition.
I can't tell whether this defines the answer.
'to become fit' is the wordplay.
I cannot really see how this works, but
'become' could be 'get' ('get' can be a synonym of 'become') and 'get' is located in the answer.
'fit' could be 'able' ('able' can be similar in meaning to 'fit') and 'able' is located in the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution?
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