At hotel wonder about vital delivery tracking system (4-3)

'delivery tracking system' is the definition.
(computer system used in cricket)

'at hotel wonder about vital' is the wordplay.
'at' says to put letters next to each other.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'wonder' becomes 'awe' (awe is a kind of wonder).
'about' means one lot of letters goes inside another.
'vital' becomes 'key' (I've seen this in other clues).
'awe' placed around 'key' is 'awkeye'.
'h'+'awkeye' is 'HAWK-EYE'.