Loose papers easy to look through? (6)

I believe the answer is:

limpid

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'easy to look through?' is the definition.
I can't tell whether this definition defines the answer.

'loose papers' is the wordplay.
'loose' becomes 'limp' (I've seen this before).
'papers' becomes 'ID' (identification papers).
'limp'+'id'='LIMPID'

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(Other definitions for limpid that I've seen before include "Calm" , "Crystal clear, transparent" , "Clear and bright" , "Crystal clear like pure water" , "Clear - tranquil" .)

I've seen this clue in The Sunday Times and The Times.

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