Crossword Genius

It's not good enough or satisfactory for organisation starting off (10)

Ross

I believe the answer is:

unsuitable

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'enough or satisfactory for organisation starting off' is the definition.
I can't tell whether this defines the answer.

'it's not good' is the wordplay.
'it's not' becomes 'un' (I've seen this in other clues**).
'good' becomes 'suitable' ('suitable' can be similar in meaning to 'good').
'un'+'suitable'='UNSUITABLE'

Can you help me to learn more?

(Other definitions for unsuitable that I've seen before include "Not appropriate" , "Inappropriate" , "Not fitting" .)

I've seen this clue in the Irish Times.
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