Dilapidated postwar sheds: they’re there to help workers (4,8)

I believe the answer is:

shop stewards

'they're there to help workers' is the definition.

'dilapidated postwar sheds' is the wordplay.
'dilapidated' indicates anagramming the letters.
'postwar'+'sheds'='postwarsheds'
'postwarsheds' is an anagram of 'SHOP-STEWARDS'.

(Another definition for shop stewards that I've seen is " Reps".)

I've seen this clue in The Times.

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