Crossword Genius

Incompetent psychiatrist entered, not getting less? (12)

Ross

I believe the answer is:

unshrinkable

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

'getting less?' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'incompetent psychiatrist entered' is the wordplay.
'incompetent' becomes 'unable' (I've seen this before).
'psychiatrist' becomes 'shrink' (informal term for a psychiatrist).
'entered' means one lot of letters goes inside another.
'unable' placed around 'shrink' is 'UNSHRINKABLE'.

'not' acts as a link.

Can you help me to learn more?

(Another definition for unshrinkable that I've seen is " (Of fabric) retaining its size".)

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