Peas in a pod hard when served with roast beef, if out to lunch (5,2,1,7)
I believe the answer is:
birds of a feather
'lunch' is the definition.
I know nothing about this answer so I can't judge whether this works.
'peas in a pod hard when served with roast beef if out' is the wordplay.
I cannot really understand how this works, but
'a' is within the answer.
'hard' could be 'h' (abbreviation used in pencil classifications) and 'h' is present in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
'out' could be 'off' (I've seen this before) and 'off' is present in the remaining letters.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for birds of a feather that I've seen before include "like-minded people" , "Likes" , "they combine well!" , "people of similar character" , "A kind" .)