Criticised as a roof may be (6)
I believe the answer is:
slated
'criticised' is the definition.
(I've seen this before)
'a roof may be' is the wordplay.
'a roof' becomes 'slate' (slate roof is a kind of roof).
'may be' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'slate'+'d'='SLATED'
'as' is the link.
Can you help me to learn more?
(Other definitions for slated that I've seen before include "Berated with roofing materials?" , "Torn to pieces" , "Reprimanded - criticised" , "censured" , "Unfavourably reviewed" .)