Those supporting Mr Morgan (5)

I believe the answer is:

piers

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'morgan' is the definition.
(Piers Morgan)

I don't understand the remainder of the clue.

(Other definitions for piers that I've seen before include "Supports for bridge spans" , "Old ploughman" , "Landing stages" , "Jetties" .)

I've seen this clue in The Sunday Times and The Times.

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