Dons may be working after mistakes (5,2)

I believe the answer is:

slips on

'dons' is the definition.
(slipping on is a kind of donning)

'working after mistakes' is the wordplay.
'working' becomes 'on'.
'after' says to put letters next to each other.
'mistakes' becomes 'slips' (slip is a kind of mistake**).
'on' after 'slips' is 'SLIPS ON'.

'may be' is the link.

I've seen this clue in The Telegraph.

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