Advance for the UK’s currency (8)
I believe the answer is:
propound
'advance' is the definition.
(thesaurus)
'for the uk's currency' is the wordplay.
'for' becomes 'pro' (I've seen this before).
'the uk's currency' becomes 'pound'.
'pro'+'pound'='PROPOUND'
(Other definitions for propound that I've seen before include "Make a submission" , "Put forward an idea for consideration" , "What Eurosceptics are" , "Advance" , "Offer for consideration" .)