Deliveries trainee's left in full view (5)
I believe the answer is:
overt
'in full view' is the definition.
(I've seen this in another clue)
'deliveries trainee's left' is the wordplay.
'deliveries' becomes 'over' (a cricket over consists of six deliveries).
'trainee's left' becomes 't' (I can't justify this - if you can you should believe this answer much more).
'over'+'t'='OVERT'
Can you help me to learn more?
(Other definitions for overt that I've seen before include "Open, up front" , "Open to view" , "Conspicuous" , "Open and observable" , "Not concealed - public" .)