Absurdly elaborate waste containers in airport cut leg (5,8)
I believe the answer is:
heath robinson
'absurdly elaborate' is the definition.
('Heath Robinson' can mean over-complicated)
'waste containers in airport cut leg' is the wordplay.
'waste containers' becomes 'bins' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'airport' becomes 'heathrow' (London airport).
'cut' means to remove the last letter.
'leg' becomes 'on' (cricket term, fielding positions).
'heathrow' with its last letter taken away is 'heathro'.
'heathro'+'on'='heathroon'
'bins' going into 'heathroon' is 'HEATH-ROBINSON'.
(Other definitions for heath robinson that I've seen before include "quirky illustrator" , "Ingenious and ridiculously over-complicated in construction" , "Absurdly complicated in design (for a machine)" , "Cartoonist known for strange machines" , "crazily complicated" .)