Crossword Genius

Rambling is so grand, but you may need these directions (4,5)

Ross

I believe the answer is:

road signs

'you may need these directions' is the definition.
(road signs usually have directions on them)

'rambling is so grand' is the wordplay.
'rambling' is an anagram indicator.
'is'+'so'+'grand'='issogrand'
'issogrand' is an anagram of 'ROAD SIGNS'.

'but' is the link.

(Other definitions for road signs that I've seen before include "pointers" , "Indications for car driver to observe" .)

I've seen this clue in The Guardian.
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