Only accepting half of UK invested in pound? That can be sorted out (7)
I believe the answer is:
soluble
'that can be sorted out' is the definition.
(able to be solved or sorted)
'only accepting half of uk invested in pound?' is the wordplay.
'only' becomes 'sole' (synonyms).
'accepting' means one lot of letters goes inside another (inserted letters are accepted).
'half of' suggests halving the letters.
'invested in' means one lot of letters goes inside another.
'pound?' becomes 'lb' (abbreviation for the unit of weight).
'uk' with half the letters taken is 'u'.
'u' going within 'lb' is 'lub'.
'sole' placed around 'lub' is 'SOLUBLE'.
(Other definitions for soluble that I've seen before include "like most acetates" , "This puzzle should be" , "Capable of being solved or dissolved" , "Capable of being solved (in water?)" , "Able to be dissolved" .)