Review? Salt away from the start for one of the titans! (5)
I believe the answer is:
atlas
'one of the titans' is the definition.
(I've seen this before)
'review? salt away from the start' is the wordplay.
'review?' is a reversal indicator (I've seen 'review' mean this).
'from the start' says to take the initial letters.
The first letter of 'away' is 'a'.
'salt'+'a'='salta'
'salta' back-to-front is 'ATLAS'.
'for' acts as a link.
(Other definitions for atlas that I've seen before include "Plans" , "book of world records?" , "world record?" , "N. African mountains; a Titan" , "Cartographer's work" .)