A glandular secretion to help get you mobile (4)

I believe the answer is:

bile

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

'a glandular secretion' is the definition.
'bile' can be an answer for 'secretion' (bile is a kind of secretion). I'm not certain of the 'a glandular' bit.

'help get you mobile' is the wordplay.
'BILE' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for bile that I've seen before include "Ill-temper" , "Fluid secreted by the liver" , "Digestive juice secreted by the liver" , "Irritability, bad temper" , "Peevish temper; a liver secretion" .)

I've seen this clue in the Evening Standard.

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