Born writer tucked into tasty bit of bread once (9)
I believe the answer is:
ninepence
'bit of bread once' is the definition.
(old coin - 'bread' can mean money)
'born writer tucked into tasty' is the wordplay.
'born' becomes 'ne' ('born' in French - used to indicate a birth name).
'writer' becomes 'pen' (something which writes).
'tucked into' is an insertion indicator.
'tasty' becomes 'nice' (nice can mean nice-tasting).
'ne'+'pen'='nepen'
'nepen' going within 'nice' is 'NINEPENCE'.
(Other definitions for ninepence that I've seen before include "amount of old money" , "Using old money, had one over the eight" , "Three-quarters of a shilling" , "in a right old state" .)