Scottish inventor takes time in temple (4)
I believe the answer is:
'scottish inventor' is the definition.
(I've seen this in another clue)
'time in temple' is the wordplay.
'time' becomes 't' (abbreviation).
'in' is an insertion indicator.
'temple' becomes 'wat' (type of Asian temple eg Angkor Wat).
't' inserted within 'wat' is 'WATT'.
'takes' acts as a link.
(Other definitions for watt that I've seen before include "James - - (Scottish inventor)" , "bit of power" , "Unit of electric power" , "Engineer, coined the term horsepower, d. 1819" , "Worker in steam" .)