Eg rubber dinghy catches cat after end of race (9)
I believe the answer is:
elastomer
'eg rubber' is the definition.
(rubber is an example)
'dinghy catches cat after end of race' is the wordplay.
'dinghy' becomes 'laser' (Laser is a brand of dinghies).
'catches' means one lot of letters goes inside another.
'cat' becomes 'tom' (a tom is a male cat).
'after' means one lot of letters go next to another.
'end of' indicates one should take the final letters.
The final letter of 'race' is 'e'.
'laser' going around 'tom' is 'lastomer'.
'lastomer' put after 'e' is 'ELASTOMER'.
(Other definitions for elastomer that I've seen before include "Stretchy polymer such as rubber" , "flexible material" , "rubber-like substance" , "Rubbery substance" .)