Squire needs way to cross Blue River (9)
I believe the answer is:
landowner
'squire' is the definition.
(I've seen this before)
'way to cross blue river' is the wordplay.
'way' becomes 'lane' (lane is a kind of way).
'to cross' means one lot of letters goes inside another.
'blue' becomes 'down' (I've seen this before).
'river' becomes 'r'.
'lane' enclosing 'down' is 'landowne'.
'landowne'+'r'='LANDOWNER'
'needs' acts as a link.
(Other definitions for landowner that I've seen before include "One with estates" , "Squire, perhaps" , "One may have lots of grass" , "One with much property" , "Man of means" .)