Don't forget about leg (8)

I believe the answer is:

remember

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'don't forget' is the definition.
(I've seen this before)

'about leg' is the wordplay.
'about' becomes 're' (regarding).
'leg' becomes 'member' (I can't justify this - if you can you should believe this answer much more).
're'+'member'='REMEMBER'

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(Other definitions for remember that I've seen before include "Bring the past to mind" , "Don't forget" , "Recall to mind" , "Commemorate" , "Summon back to mind" .)

I've seen this clue in The Daily Express.

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