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Out of practice, head of firm's removed (5)

Ross

I believe the answer is:

rusty

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'out of practice' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for rusty that I've seen before include "Oxidised, corroded" , "a bit faded" , "Behind the times" , "Stiff with age" , "(Of iron) affected by damp" .)

I've seen this clue in The Telegraph.
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