Victoria wasn't thought to follow Albert's lead (6)
I believe the answer is:
amused
'victoria wasn't' is the definition.
(Queen Victoria supposedly said 'we are not amused')
'thought to follow albert's lead' is the wordplay.
'thought' becomes 'mused' (musing is a kind of thinking).
'to follow' means one lot of letters go next to another (some letters go after or follow others).
'lead' says to take the initial letters.
The initial letter of 'alberts' is 'a'.
'mused' after 'a' is 'AMUSED'.
(Other definitions for amused that I've seen before include "Kept someone entertained" , "Mildly diverted or entertained" , "Medusa (anag)" , "Delighted" , "Mildly entertained by Medusa" .)