Crossword Genius

Pressure on agent bad in Defense Department (8)

Ross

I believe the answer is:

pentagon

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

'defense department' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'pressure on agent bad' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'bad' is an anagram indicator.
'on'+'agent'='onagent'
'onagent' with letters rearranged gives 'entagon'.
'p'+'entagon'='PENTAGON'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for pentagon that I've seen before include "rectangle snipped at one corner?" , "Location of the US Department of Defense" , "top brass" , "Headquarters of the US Defence Department" , "Geometric figure with five sides" .)

I've seen this clue in The Sun.
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