Repaired rail is best steadying device (10)

I believe the answer is:

stabiliser

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'steadying device' is the definition.
The definition suggests a singular noun which matches the answer.

'repaired rail is best' is the wordplay.
'repaired' is an anagram indicator.
'rail'+'is'+'best'='railisbest'
'railisbest' is an anagram of 'STABILISER'.

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(Other definitions for stabiliser that I've seen before include "Tailplane" , "Device reducing rolling of ship" .)

I've seen this clue in The Times.

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