Bodies in swimming costumes (6)
I believe the answer is:
trunks
'bodies in' is the definition.
'trunks' can be an answer for 'bodies' (I've seen this in another clue). I'm not sure about the 'in' bit.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for trunks that I've seen before include "Main stems of trees" , "Parts of trees and elephants" , "Men's swimsuits on an elephants?" , "Swimming garments or tree stems" , "Elephants can provide such cases" .)