Crossword Genius

Tons lacking power to make changes (5)

Ross

I believe the answer is:

tweak

'make changes' is the definition.

'tons lacking power' is the wordplay.
'tons' becomes 't'.
'lacking power' becomes 'weak' ().
't'+'weak'='TWEAK'

'to' acts as a link.

(Other definitions for tweak that I've seen before include "Make fine adjustment" , "Fine-tune, twist" , "Pinch sharply" , "Edit" , "spin, thus?" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app