Ponder something of conundrum in a text (8)
I believe the answer is:
ruminate
'ponder' is the definition.
(I know that ponder can be written as ruminate)
'something of conundrum in a text' is the wordplay.
'something of' says the answer is hidden in the clue (I've seen 'something' mean this (I've seen this in other clues)).
'RUMINATE' is hidden within 'conundrum in a text'.
(Other definitions for ruminate that I've seen before include "Meditate, or chew the cud" , "Think deeply" , "'Reflect deeply, chew the cud (8)'" , "Think over - as cows do?" , "deliberate" .)