Faulty program is strangely retained (5)

I believe the answer is:

amiss

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

'faulty' is the definition.
(I've seen this before)

'program is strangely retained' is the wordplay.
'AMISS' is hidden in amongst the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for amiss that I've seen before include "Wrong - awry" , "Revealing fault" , "Not quite right" , "Taking wrong turn" , "inappropriately" .)

I've seen this clue in The Hindu.

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