Imitate departure from Heathrow? (4-3)
I believe the answer is:
take-off
'imitate' is the definition.
(taking off is a kind of imitating)
'departure from heathrow?' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'off' (eg someone might be from or 'off' a TV show) and 'off' is found within the answer.
The remaining letters 'take' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for take-off that I've seen before include "burlesque" , "Leaving the ground" , "Act of mimicry" .)