Spread some across cat terminally (7)
I believe the answer is:
scatter
'spread' is the definition.
(scatter is a kind of spread)
'some across cat terminally' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'SCATTER' is hidden in the letters of 'across cat terminally'.
(Other definitions for scatter that I've seen before include "Broadcast" , "Strew randomly" , "Throw around; disperse" , "Strew over an area" , "Car test (anag)" .)