Posh bloke in rowing venue's content to get honour (7)
I believe the answer is:
ennoble
'honour' is the definition.
(I know that ennoble is a more specific form of the action honour)
'posh bloke in rowing venue's content' is the wordplay.
'posh bloke' becomes 'nob' (nob can mean an aristocrat).
'in' means one lot of letters goes inside another.
'rowing venue' becomes 'Henley' (as in the Henley Royal Regatta).
'content' indicates the central letters.
The central letters of 'henley' are 'enle'.
'nob' placed inside 'enle' is 'ENNOBLE'.
'to get' is the link.
(Other definitions for ennoble that I've seen before include "Bestow high rank upon" , "Bestow peerage on" , "Dignify" , "Bestow honour upon" , "Make a count, perhaps" .)