Useful feature to order any time (7)
I believe the answer is:
amenity
'useful feature' is the definition.
(I've seen this before)
'order any time' is the wordplay.
'order' is an anagram indicator.
'any'+'time'='anytime'
'anytime' with letters rearranged gives 'AMENITY'.
'to' acts as a link.
(Other definitions for amenity that I've seen before include "Item provided to make life easier" , "Feature of place that makes living pleasant and convenient" , "Library perhaps" , "Useful feature (of place/ building)" , "Pleasant, useful, feature" .)