Accommodation on moorland proved to be a letdown (4,4)
I believe the answer is:
fell flat
'proved to be a letdown' is the definition.
I can't tell whether this defines the answer.
'accommodation on moorland' is the wordplay.
'accommodation' becomes 'flat' (type of residence).
'on' says to put letters next to each other.
'moorland' becomes 'fell' (fell can mean a moor).
'flat' put after 'fell' is 'FELL FLAT'.
Can you help me to learn more?
(Other definitions for fell flat that I've seen before include "provoked no interest" , "failed to impress" , "collapsed" .)