Crossword Genius

A plumber's at work above yard doubtless (10)

Ross

I believe the answer is:

presumably

'doubtless' is the definition.
(thesaurus)

'a plumber's at work above yard' is the wordplay.
'at work' indicates an anagram.
'above' is a charade indicator (letters next to each other).
'yard' becomes 'y'.
'a'+'plumbers'='aplumbers'
'aplumbers' anagrammed gives 'presumabl'.
'presumabl'+'y'='PRESUMABLY'

I've seen this clue in The Telegraph.
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