Restorative, until mast gets fixed (9)

I believe the answer is:

stimulant

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'restorative' is the definition.
(thesaurus)

'until mast gets fixed' is the wordplay.
'until mast' can be anagrammed to 'STIMULANT'.
Though, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for stimulant that I've seen before include "Means of prompting action" , "Energizer" , "Reviver" , "pepper" , "Increasing vital action" .)

I've seen this clue in The Daily Express.

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