Crossword Genius

Certain fluids can form a skin (4)

Ross

I believe the answer is:

inks

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

'certain fluids' is the definition.
'inks' can be an answer for 'fluids' (ink is a kind of fluid). I am not sure about the 'certain' bit.

'form a skin' is the wordplay.
'form' indicates an anagram (another form of the letters).
'skin' is an anagram of 'INKS'.

'can' acts as a link.

Can you help me to learn more?

(Other definitions for inks that I've seen before include "Fluids from cuttlefish" , "Printing fluids" , "Liquids used for printing" , "Printers' mediums" , "Sink beneath writing fluids" .)

I've seen this clue in the Evening Standard.
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