2 Down, Girl left one in the middle of Atlantic,say (5) C?L?A
18 Down, Unknown stink about about price rises for potato (6) M?R???
21 Down, Turned chill, suppressing one supplier of information (6)
?O?R?E
23 Down, Takes up line, getting over chasms after river falls (5) L?F?S
Compiler - PHI
Many Thanks