Describing shock of aimless drifting (7)

I believe the answer is:

seismal

'describing shock' is the definition.
(relating to earthquakes)

'aimless drifting' is the wordplay.
'drifting' indicates anagramming the letters.
'aimless' with letters rearranged gives 'SEISMAL'.

'of' acts as a link.

(Another definition for seismal that I've seen is " Relating to earthquakes".)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app