More than one older lamb chop lasagne’s crust’s not kept well (10)
I believe the answer is:
ramshackle
'not kept well' is the definition.
(ramshackle means badly maintained or kept)
'more than one older lamb chop lasagne's crust's' is the wordplay.
'more than one older lamb' becomes 'rams' (rams are adult male sheep).
'chop' becomes 'hack' (synonyms).
'crust's' suggests removing the centre (I've seen 'crust' mean this (the outside or crust of the word is used)).
'lasagne' with its middle removed is 'le'.
'rams'+'hack'+'le'='RAMSHACKLE'
(Other definitions for ramshackle that I've seen before include "Broken-down" , "Tumbledown" , "Rickety - derelict" , "Badly-organised" , "In poor condition" .)