One caught in an ambush? (3)
I believe the answer is:
bus
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'caught in an ambush?' is the wordplay.
'caught in' indicates the answer is hidden within the clue.
'BUS' can be found hidden inside 'ambush'.
Can you help me to learn more?
(Other definitions for bus that I've seen before include "Something caught" , "Large passenger vehicle - small business!" , "Means of public transport" , "Of projectiles; (go) mad (slang)" , "Charabanc" .)