'150 + 50' overwhelms Heather in Administration (8)

I believe the answer is:

clerical

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'150 50 overwhelms heather in administration' is the definition.
I can't judge whether this defines the answer.

'150 50 overwhelms heather' is the wordplay.
'150' becomes 'CL' (Roman numerals).
'50' becomes 'l' (Roman numeral).
'overwhelms' indicates putting letters inside.
'heather' becomes 'erica' (the plant genus Erica includes heather plants).
'cl'+'l'='cll'
'cll' placed around 'erica' is 'CLERICAL'.

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(Other definitions for clerical that I've seen before include "White-collar" , "concerned with office" , "Such a life Eliot depicted" , "Relating to the priesthood or office work" , "Relating to the clergy" .)

I've seen this clue in The Independent.

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