Alarming manoeuvres along the borders (8)
I believe the answer is:
marginal
'along the borders' is the definition.
I can't tell whether this defines the answer.
'alarming manoeuvres' is the wordplay.
'manoeuvres' indicates anagramming the letters (letters manoeuvred in a new way).
'alarming' with letters rearranged gives 'MARGINAL'.
Can you help me to learn more?
(Other definitions for marginal that I've seen before include "Alarming (anag) - too small to matter" , "Of minor importance" , "Peripheral in alarming way" , "having small majority at risk" , "On the edges of" .)