Inexpensiveness of gold daughter accepted in good humour (13)
I believe the answer is:
affordability
'inexpensiveness' is the definition.
(quality of being affordable)
'gold daughter accepted in good humour' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'daughter' becomes 'd' (genealogical abbreviation).
'accepted in' is an insertion indicator (I've seen this in other clues).
'good humour' becomes 'affability' (I've seen this before).
'or'+'d'='ord'
'ord' inserted into 'affability' is 'AFFORDABILITY'.
'of' acts as a link.
(Another definition for affordability that I've seen is " What determines if one has enough to buy item".)