He'll announce drivers' tea break (10)

I believe the answer is:

advertiser

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'he'll announce' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'drivers' tea break' is the wordplay.
'break' is an anagram indicator.
'drivers'+'tea'='driverstea'
'driverstea' is an anagram of 'ADVERTISER'.

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(Other definitions for advertiser that I've seen before include "Part of a newspaper's title" , "Promoter" , "One publicising a product (S, not Z)" , "Commercial producer" , "He pushes" .)

I've seen this clue in The Globe and Mail.

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