Notices erected, enrols (5,2)

I believe the answer is:

signs up

'enrols' is the definition.
(I've seen this before)

'notices erected' is the wordplay.
'notices' becomes 'signs' ().
'erected' becomes 'up'.
'signs'+'up'='SIGNS UP'

(Other definitions for signs up that I've seen before include "Enrols" , "volunteers" , "Recruits" .)

I've seen this clue in The Daily Express.

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