Said to be a rough old collar (4)

I believe the answer is:

ruff

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'old collar' is the definition.
'ruff' can be an answer for 'collar' (ruff is a kind of collar). I'm not sure about the 'old' bit.

'said to be a rough' is the wordplay.
'said to be' shows a homophone (sound like).
'rough' is a homophone of 'RUFF'.

Can you help me to learn more?

(Other definitions for ruff that I've seen before include "Win a trick by using a trump" , "(At bridge) trump" , "Starched frill collar" , "Circular pleated collar - trump" , "Elizabethan or Jacobean neck adornment" .)

I've seen this clue in the Evening Standard.

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