Complete circuit (3)
'complete circuit' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lap that I've seen before include "Thighs, when seated" , "Drink (like dog), circuit" , "Track circuit; drink" , "A circuit of a racecourse" , "One circuit of track" .)
'complete circuit' is the definition.
(complete circuit of the field in the game rounders)
This is the entire clue.
(Other definitions for rounder that I've seen before include "complete circuit in a game" , "More rotund" , "Score in bat and ball game" , "More circular" , "Or under (anag.)" .)