Constrained by underwhelming leadership (4)

I believe the answer is:

helm

I'm a little stuck... Click here to teach me more about this clue!

'leadership' is the definition.
(I know that helm is a type of leadership)

'constrained by underwhelming' is the wordplay.
'HELM' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for helm that I've seen before include "Steersman's place" , "Ship's steering apparatus" , "Steer (a boat/ship)" , "Steer (a boat or ship)" , "part of boat near stern" .)

I've seen this clue in The Independent.

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