Crossword Genius

Gold medallist takes head off part of the target (5)

Ross

I believe the answer is:

inner

Here is my best explanation:

'part of the target' is the definition.

'gold medallist takes head off' is the wordplay.
'gold medallist' becomes 'winner'.
'takes head off' means to remove the first letter (I've seen 'taking head off' mean this).
'winner' with its initial letter taken off is 'INNER'.

This clue was last seen in The Times