I see GB in disarray and English beset with hostile forces (7)
I believe the answer is:
besiege
'beset with hostile forces' is the definition.
'i see gb in disarray and english' is the wordplay.
'in disarray' indicates anagramming the letters.
'and' is a charade indicator (letters next to each other).
'english' becomes 'e' (abbreviation).
'i'+'see'+'gb'='iseegb'
'iseegb' is an anagram of 'besieg'.
'besieg'+'e'='BESIEGE'
(Other definitions for besiege that I've seen before include "Blockade" , "Surround - harass" , "Enclose, preventing ingress or egress" , "Invest" , "'Harass, beleaguer (7)'" .)