More than one unit teetotaller was consuming? (5)
I believe the answer is:
watts
'more than one unit' is the definition.
(watt is a kind of unit)
'teetotaller was consuming?' is the wordplay.
'teetotaller' becomes 'tt' (abbreviation).
'consuming?' means one lot of letters goes inside another.
'tt' going within 'was' is 'WATTS'.
(Other definitions for watts that I've seen before include "Sculptor" , "G. F. -, Eng. artist; power units" , "Rolling Stones drummer?" , "Power units (lighting)" , "rates of working" .)