After adjustment, agree best rent, being accommodating (5,2,6)
I believe the answer is:
eager to please
'being accommodating' is the definition.
(someone accommodating is eager to please)
'after adjustment agree best rent' is the wordplay.
'after' means one lot of letters go next to another.
'adjustment' indicates an anagram (I've seen 'adjustment of' mean this (I've seen this in other clues)).
'best' becomes 'top' (top can mean the very best).
'rent' becomes 'lease' (I've seen this before).
'agree' anagrammed gives 'eager'.
'eager'+'top' is 'eagertop'.
'eagertop'+'lease'='EAGER TO PLEASE'
(Another definition for eager to please that I've seen is " Obliging".)