It can't run so takes cover (5)

I believe the answer is:

solid

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'it can't run' is the definition.
The definition suggests a singular noun which matches the answer.

'so takes cover' is the wordplay.
'takes' says to put letters next to each other.
'cover' becomes 'lid' (lid is a kind of cover).
'so'+'lid'='SOLID'

Can you help me to learn more?

(Other definitions for solid that I've seen before include "Not hollow or liquid" , "Weighty" , "Three-dimensional shape, not hollow" , "Firm, strong" , "Of substance" .)

I've seen this clue in The Globe and Mail.

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