Write name on flag (6)

I believe the answer is:

pennon

'flag' is the definition.
(I know that pennon is a type of flag)

'write name on' is the wordplay.
'write' becomes 'pen' (synonyms).
'name' becomes 'n' (common abbreviation e.g. on forms).
'pen'+'n'+'on'='PENNON'

(Other definitions for pennon that I've seen before include "one might be all of a flutter" , "Pointed flag" , "Knight's personal flag" , "Long narrow triangular flag" , "Narrow, swallow-tailed standard" .)

I've seen this clue in The Telegraph.

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