Crossword Genius

Chance to meet clever guy going to hospital after military command (4,2,4)

Ross

I believe the answer is:

fall in with

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

'military command' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.

'chance to meet clever guy going to hospital' is the wordplay.
I cannot quite understand how this works, but
'hospital' could be 'h' and 'h' is found in the answer.
'going to' could be 'll' (as in he'll, we'll etc) and 'll' is present in the answer.
This explanation may well be incorrect...

'after' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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