Temperature doubled in a drain almost causes crack (7)
I believe the answer is:
attempt
'crack' is the definition.
(I've seen this before)
'temperature doubled in a drain almost' is the wordplay.
'temperature' becomes 't' (abbreviation).
'doubled' indicates the doubling of some letters.
'in' means one lot of letters goes inside another.
'drain almost' becomes 'empt' (I can't justify this - if you can you should give a lot more credence to this answer).
't' duplicated is 'tt'.
'a'+'empt'='aempt'
'tt' inserted within 'aempt' is 'ATTEMPT'.
'causes' acts as a link.
Can you help me to learn more?
(Other definitions for attempt that I've seen before include "Shot" , "Endeavor, try" , "bid to kill someone" , "Embark on, try" , "Effort; go" .)