Follow the transcript of the trial (5)
I believe the answer is:
trail
'follow the transcript' is the definition.
'trail' can be an answer for 'follow' (trail can mean to follow in secret). I am unsure of the 'the transcript' bit.
'of the trial' is the wordplay.
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'trial' with letters rearranged gives 'TRAIL'.
Can you help me to learn more?
(Other definitions for trail that I've seen before include "Follow - track" , "Track or scent used in following someone" , "Linger behind" , "Path or track through wild or hilly country" , "Pursue" .)