Gather round Romeo's lorry (5)
I believe the answer is:
'lorry' is the definition.
(I know that lorry can be written as truck)
'gather round romeo's' is the wordplay.
'gather' becomes 'tuck' (synonyms).
'round' means one lot of letters goes inside another.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'tuck' going around 'r' is 'TRUCK'.
(Other definitions for truck that I've seen before include "Freight vehicle" , "Vehicle (with which one has no dealings?)" , "Large road vehicle" , "Lorry - wagon" , "Exchange" .)