Fellowship of real ale drinkers crossing a delta and lake (11)
I believe the answer is:
camaraderie
'fellowship' is the definition.
(I've seen this before)
'real ale drinkers crossing a delta and lake' is the wordplay.
'real ale drinkers' becomes 'CAMRA' (Campaign for Real Ale organisation).
'crossing' is an insertion indicator (to cross can mean to go over or around).
'delta' becomes 'd' (phonetic alphabet: alpha, bravo, charlie etc.).
'and' says to put letters next to each other.
'lake' becomes 'Erie' (Lake Erie is one of the Canadian/US 'Great Lakes').
'camra' enclosing 'a' is 'camara'.
'camara'+'d'+'erie'='CAMARADERIE'
'of' acts as a link.
(Other definitions for camaraderie that I've seen before include "Friendly sociability" , "Esprit de corps" , "Fellowship" , "Main theme of Friends" , "Mutual trust and friendship" .)