Aunt robbed of £50, let's suppose (3)
I believe the answer is:
say
'suppose' is the definition.
(synonyms)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for say that I've seen before include "Judge" , "Utter, recite" , "Speak, declare" , "SECOND PART OF 24" , "Utter words" .)