Row when there's less than complete observation of instructions (7)
I believe the answer is:
ruction
'row' is the definition.
(thesaurus)
'less than complete observation of instructions' is the wordplay.
'less than complete observation of' indicates a hidden word (only some letters in the clue should be observed).
'RUCTION' is hidden in the letters of 'instructions'.
'when there's' is the link.
(Other definitions for ruction that I've seen before include "Uproar" , "Find a disturbance in cut iron" , "Disturbance, quarrel" , "Noisy disturbance" , "Ruckus, rumpus" .)