Hold-up man tucks into meat lasagne (5)
I believe the answer is:
atlas
'hold-up man' is the definition.
(Greek mythology - he held up the world)
'tucks into meat lasagne' is the wordplay.
'tucks into' says the answer is hidden in the clue (I've seen 'tucked into' mean this).
'ATLAS' can be found hidden inside 'meat lasagne'.
(Other definitions for atlas that I've seen before include "Mythological Titan (involved with the world of maps?)" , "Titan who held up the sky" , "One hugely burdened" , "Segment of spine" , "Size of paper once" .)