Unspecified bug blocked by IT service (7)

I believe the answer is:

liturgy

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

'unspecified bug blocked by it' is the wordplay.
'unspecified bug' becomes 'lurgy' (I can't justify this - if you can you should believe this answer much more).
'blocked by' means one lot of letters goes inside another (I've seen this in other clues).
'lurgy' placed around 'it' is 'LITURGY'.

Can you help me to learn more?

(Other definitions for liturgy that I've seen before include "Religious rite" , "Standard form of church service" , "gives order for service" , "Form of religious service" , "Form of worship" .)

I've seen this clue in The Independent.

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