Damage most of strange tent (7)
I believe the answer is:
marquee
'tent' is the definition.
(I know that marquee is a type of tent)
'damage most of strange' is the wordplay.
'damage' becomes 'mar' (to mar is to spoil or damage).
'most of' means to remove the last letter.
'strange' becomes 'queer' (synonyms).
'queer' with its final letter removed is 'quee'.
'mar'+'quee'='MARQUEE'
(Other definitions for marquee that I've seen before include "Large and often sumptuous tent" , "Tented pavilion" , "event venue" , "Large tent used for party, exhibition etc" , "Canvas pavilion" .)