Ram, once uncontrollable, shows love (7)

I believe the answer is:

romance

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

'love' is the definition.
(romancing is a kind of loving)

'ram once uncontrollable' is the wordplay.
'ram once' anagrams to 'ROMANCE'.
However, I'm not clear how this is indicated.

'shows' acts as a link.

Can you help me to learn more?

(Other definitions for romance that I've seen before include "Novel - affair" , "Group of languages" , "Court" , "Novel - love story" , "Affair of the heart" .)

I've seen this clue in The Sun.

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