Order to pay tailor finally for a jumper (7)
I believe the answer is:
chequer
'for a jumper' is the definition.
I can't judge whether this definition defines the answer.
'order to pay tailor finally' is the wordplay.
'order to pay' becomes 'cheque' (I've seen this before).
'finally' says to take the final letters.
The last letter of 'tailor' is 'r'.
'cheque'+'r'='CHEQUER'
Can you help me to learn more?
(Other definitions for chequer that I've seen before include "Board game piece" , "Pattern of squares of different colours" , "Draughts piece" , "Mark into squares of different colours" , "Alternation of colours" .)