Doctor is sick in hospital taking direction from boring people (8)

'boring people' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'doctor is sick in hospital taking direction' is the wordplay.
'doctor' becomes 'dr' ('Dr' can be a synonym of 'doctor').
'is sick' becomes 'ill' ('ill' can be similar in meaning to 'sick').
'in hospital' becomes 'er' (I've seen this in other clues).
'taking' says to put letters next to each other.
'direction' becomes 's' (S is an example).
'dr'+'ill'+'er'+'s'='DRILLERS'

'from' acts as a link.

Can you help me to learn more?