Swimmer after British gems (5)
I believe the answer is:
bling
'swimmer after british gems' is the definition.
I can't judge whether this defines the answer.
'swimmer after british' is the wordplay.
'swimmer' becomes 'ling' (ling is a type of fish).
'after' says to put letters next to each other.
'british' becomes 'b' (abbreviation e.g. in BBC).
'ling' after 'b' is 'BLING'.
Can you help me to learn more?
(Other definitions for bling that I've seen before include "Showy jewels etc" , "Flashy, ostentatious jewellery" , "glitzy jewellery" , "Jazzy" , "Showy jewellery" .)