Yearly cost of accommodation in relation to older pair (8)
I believe the answer is:
parental
'accommodation in relation to older pair' is the definition.
I can't judge whether this defines the answer.
'yearly cost' is the wordplay.
'yearly' becomes 'pa' (abbreviation for per annum).
'cost' becomes 'rental' (I have seen 'Cost of hire ' mean 'rental' so perhaps 'cost' could also mean 'rental').
'pa'+'rental'='PARENTAL'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for parental that I've seen before include "of old man and woman" , "Of mother and/or father" , "of some older relatives" , "of father, perhaps" , "Relating to mother and father" .)