Married the writer (reptile), knowing a bit from a computer (9)
I believe the answer is:
microchip
'a computer' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'married the writer reptile knowing a bit' is the wordplay.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'the writer' becomes 'I' (the person who is writing these clues).
'reptile' becomes 'croc' (short for crocodile).
'knowing a bit' becomes 'hip' (I can't justify this - if you can you should believe this answer much more).
'm'+'i'+'croc'+'hip'='MICROCHIP'
'from' is the link.
Can you help me to learn more?
(Other definitions for microchip that I've seen before include "Integrated circuit" , "produced in Silicon Valley?" , "Bit of hardware" , "processor?" , "Tiny circuit bearer" .)