Labour type (6)

I believe the answer is:

strain

I believe this clue is a double definition.

'labour' is the first definition.
(strain is a kind of labour)

'type' is the second definition.
(thesaurus)

(Other definitions for strain that I've seen before include "Noted" , "Try too hard" , "song" , "Tension - stock" , "Difficulty that causes tension" .)

I've seen this clue in The Telegraph.

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