Gas meter almost broken by workman...almost (7)
I believe the answer is:
methane
'gas' is the definition.
(I've seen this before)
'meter almost broken by workman almost' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'broken by' is an insertion indicator.
'workman' becomes 'hand' (hand is a kind of workman).
'almost' means to remove the last letter (most of the word but not all of it).
'meter' with its last letter removed is 'mete'.
'hand' with its last letter removed is 'han'.
'mete' going around 'han' is 'METHANE'.
(Other definitions for methane that I've seen before include "Firedamp" , "Marsh gas - the name (anag)" , "Marsh-gas" , "Naturally occurring flammable gas" , "contributor to global warming" .)