Squashed toad lies off the beaten track (8)
I believe the answer is:
isolated
'off the beaten track' is the definition.
(I've seen this before)
'squashed toad lies' is the wordplay.
'squashed' indicates an anagram.
'toad'+'lies'='toadlies'
'toadlies' with letters rearranged gives 'ISOLATED'.
(Other definitions for isolated that I've seen before include "Cut off, remote" , "Placed alone" , "Set apart from others" , "Single" , "Remote, set apart" .)