Payment made with fake euro, one GCHQ investigate finally (4,6)

'payment' is the definition.
(giro cheque is a method of payment)

'fake euro one gchq investigate finally' is the wordplay.
'fake' indicates anagramming the letters (I've seen this in other clues).
'one' becomes 'i' (Roman numeral).
'finally' says to take the final letters.
The final letter of 'investigate' is 'e'.
'euro'+'i'+'gchq'='euroigchq'
'euroigchq' with letters rearranged gives 'girochequ'.
'girochequ'+'e'='GIRO CHEQUE'

'made with' is the link.