13 across
Isolate
small
wader
scratching
back
at
barrier
(9)
Isolate small wader scratching back at barrier (9)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Isolate, meaning to set apart or separate. Small gives S, the wader EGRET loses its final letter ("scratching back") to give EGRE, and barrier gives GATE, so S+EGRE+GATE spells SEGREGATE.