Over time, ridiculous to bury head in sand like this? (7)
I believe the answer is:
ostrich
'head in sand like this?' is the definition.
The definition suggests a singular noun which matches the answer. I also know that both 'head' and 'sand' relate to this answer.
'over time ridiculous to bury' is the wordplay.
'over' is a charade indicator (letters next to each other).
'time' becomes 't'.
'ridiculous' becomes 'rich' ('that's rich' can mean 'that's ridiculous').
'to bury' becomes 'os' (I can't justify this - if you can you should give a lot more credence to this answer).
't'+'rich'='trich'
'trich' put after 'os' is 'OSTRICH'.
(Other definitions for ostrich that I've seen before include "Runner" , "Person refusing to face reality" , "World's largest bird" , "The biggest bird, can't fly" , "Creature" .)