Needing money from son, in a corner (8)
I believe the answer is:
strapped
'needing money' is the definition.
(strapped for cash)
'son in a corner' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'in a corner' becomes 'trapped' (I've seen this in another clue).
's'+'trapped'='STRAPPED'
'from' is the link.
(Other definitions for strapped that I've seen before include "Bound" , "- - for cash (hard up)" , "Without, or very short of, cash" , "Without, or very short of, money" , "affected by shortage" .)