Craft secondarily supporting the police in motion? (10)
I believe the answer is:
helicopter
'craft' is the definition.
(I know that helicopter is a type of heavier-than-air craft)
'secondarily supporting the police in motion?' is the wordplay.
'secondarily' becomes 'r' (I can't justify this - if you can you should believe this answer much more).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'in motion?' is an anagram indicator (I've seen this in other clues).
'the'+'police'='thepolice'
'thepolice' with letters rearranged gives 'helicopte'.
'r' after 'helicopte' is 'HELICOPTER'.
Can you help me to learn more?
(Other definitions for helicopter that I've seen before include "aircraft" , "This can be used to transport" , "Rotary-winged craft" , "surveillance equipment" , "surveillance vehicle" .)